My scratch built would be based on Locost plans, but with a modified frame to take an electric motor and batteries. The frame would be aluminium to save weight, with a custom fibreglass body with faired in rear wheels and a more traditional coupe look rather than the tub of the original Lotus. In my EV case, the motor would be longitudinally mounted in he rear of the transmission tunnel, directly coupled to a diff from a small car such as the MX5 (Miata). Fairly skinny wheels and tyres, low weight, small frontal area (low rather than narrow) would all contribute to better mpg. Although my plan would be for an EV, all the above would apply equally well to a diesel engined version.
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